Improved chimney for lamps



E. P DICKIE.

Lamp Chimney. No. 34,293. v Patented Feb 4; 1862.

UNITED STATES PATENT OFFICE.

EDWARD P. DIOKIE, OF FISHKILL LANDING, NEW YORK.

IMPROVED CHIMNEY FOR LAMPS.

Specification forming part of Letters Patent No. 34,293, dated February4, 1862.

To all whom it may concern.-

Be it known that I, EDWARD P. DIoKIE, of Fishkill Landing, in the countyof Dutchess and State of New York, have invented a certain new andImproved Chimney for Lamps; and I do hereby declare that the followingis a full and exact description of the same, reference being had to theaccompanying drawings, in which- Figure 1 is a vertical section of thechimney and a side elevation of a portion of an ordinary lamp on whichit is mounted. Fig. 2 is a corresponding section of my chimney partiallyformed, illustrating one of the modes'in which my invention maybesuccessfully made; and Fig. 3 is a horizontal section on line S S inFig. 1.

Similar letters refer to like parts in all the figures.

My chimney is intended for use on those lamps in which kerosene oranalogous material is burned, which requires the air to be directed uponthe flame in a peculiar manner.

My improvement allows the cone heretofore believed to be necessary to beentirely dispensed with, and provides for the presentation of the air ina proper manner by the form of the chimney alone.

In the drawings, A represents the upper portion of an ordinary lamp; B,the ordinary fiat wick-tube used in connection with my invention,and Ddmyimproved chimney. It must be observed that d is a partial partition orplatform somewhat swelled or rounded upward, and partially closes whatis ordinarily a very large space in the chimney. Its presence leavesonly a narrow opening E for the upward passage of the flame and air atthat point. The height of at above the base of the chimney, or ratherabove the top of the fiat wick-tube B, is about equal to the height ofthe ordinary cone.

My improved chimney must be made with a view to guard as much aspossible against fracture from sudden changes of temperature. With thisview all the ordinary means used by glass-workers must be employed, suchas the use of very soft glass, or that in which a large proportion oflead is introduced and long annealing. With these precautions my chimneyhas been found by experiment to endure very well, and it is believedwill be no more liable to break than ordinary chimneys.

The means I have found successful in pro ducing the proper form are tofirst shape an ordinary chimney of about the proper size,

next to contract it greatly at the point where d is to be produced;thirdly, to flatten the contracted part by compression between suit ablepinchers, so as to leave a passage within of the proper size and formfor for the aperture E, and, lastly, to press the contracted partstogether and upward by applying it upon a suitable metallic formerintroduced from below. By this mode of manufacture, one stage of whichis shown in Fig. 3, the part dis made of what was originally twothicknesses of glass. I do not confine myself to this precise mode ofconstruction, because any means which will produce the suitable finalform may probably be successful.

The advantage due to the use of my invention as compared with ordinarychimneys and opaque cones is a very marked increase in the quantity oflight, especially when the flame is either intentionally or otherwisesmall. With small flames there is a large proportion thereof close tothe wicktube. Under such circumstances the ordinary opaque cones allowthe utilization of only that portion of the light which is thrown upwardthrough the top of the cone and the glass cones sometimes used, althoughthey allow light to pass through them, necessarily obstruct, destroy,reflect back, and weaken the light. In the use of glass cones the lightpassing through the cone has evidently to pass also through the chimney,which is exterior thereto, and thus the useful effect of the light isweakened by its double transmission through glass, as also by all thesmoke, dust, or other foreign matter adhering to the duplicatedsurfaces. In my invention the light from that portion of the flamebeneath d is allowed to impinge directly against the side of the chimneyand pass out without any additional obstruction.

The partial partition 61 may be perfectly plane instead of swelled, ormay be swelled more or loss than represented, and joined to the sides ofthe chimney at a higher or lower level than is represented, according ascirtition d when made part of and of the same cumstanees shall renderdesirable. piece as the chimney, substantially as and so Having nowdescribed my invention, what as to realize the advantage herein setforth. I claim, and desire to secure by Letters Pat- ED. P. DIOKIE. ent,is Witnesses:

In glass chimneys for illuminating pur- H. M. OOLLYER,

poses, the transparent partition or partial par- D. W. STETSON.

